Improbable as it may seem after the highly successful "Mr. Selfridge," PBS viewers can look forward to another period series set in a great department store, though there all similarity ends. "The Paradise" is different in every important regard, not least its infinite superiority as drama—a kind that sustains its relentless tension amid all the gaiety and lushness of its setting. Its probing eye can keep its sardonic focus on the issues of caste and class and reflect, at the same time, the infectious sense of wonder and exhilaration that attaches...